<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./vuejs/vue.js"></script>
    <script src="./vuejs/lodash.js"></script>
</head>
<body>
    <style>
        .list-item{
            display: inline-block;margin-right: 10px;background-color: red;
            border-radius: 50%;width: 25px;height: 25px;text-align: center;line-height: 25px; color: #fff;
        }
        .list-enter-active, .list-leave{
            transition: all 2s;
        }
.list-enter, .list-leave-to{
    opacity: 0;
    transform: translateY(30px);
}
.list-move{
    transition: transform 1s;
}

    </style>
    <div id="app">
    <button @click="add">随机插入一个数字</button>
    <button @click="remove">随机删除一个数字</button>
    <button @click="shuffle">洗牌</button>
    <transition-group name="list" tag="p">
        <span v-for="item in items" :key="item" class="list-item">
            {{item}}
        </span>
    </transition-group>
</div>
    <script>
        var vm = new Vue({
            el:'#app',
            data:{
                items:[1,2,3,4,5],
                nextNum:6
            },
            methods:{
                randomIndex(){
                    return Math.floor(Math.random() * this.items.length)
                },
                add(){
                this.items.splice(this.randomIndex(), 0, this.nextNum++)
            },
            remove(){
                this.items.splice(this.randomIndex(), 1)
            },
            shuffle(){
                this.items= _.shuffle(this.items)
            }
            }
           
        })

    </script>
</body>
</html>